/*
 * cocos2d for iPhone: http://www.cocos2d-iphone.org
 *
 * Copyright (c) 2009-2010 Ricardo Quesada
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 *
 * TMX Tiled Map support:
 * http://www.mapeditor.org
 *
 */

#import "CCTMXLayer.h"
#import "CCTMXTiledMap.h"
#import "CCTMXXMLParser.h"
#import "CCSprite.h"
#import "CCSpriteBatchNode.h"
#import "CCTextureCache.h"
#import "Support/CGPointExtension.h"

#pragma mark -
#pragma mark CCSpriteBatchNode Extension

/* IMPORTANT XXX IMPORTNAT:
 * These 2 methods can't be part of CCTMXLayer since they call [super add...], and CCSpriteSheet#add SHALL not be called
 */
@implementation CCSpriteBatchNode (TMXTiledMapExtension)

/* Adds a quad into the texture atlas but it won't be added into the children array.
 This method should be called only when you are dealing with very big AtlasSrite and when most of the CCSprite won't be updated.
 For example: a tile map (CCTMXMap) or a label with lots of characgers (BitmapFontAtlas)
 */
-(void) addQuadFromSprite:(CCSprite*)sprite quadIndex:(unsigned int)index
{
	NSAssert( sprite != nil, @"Argument must be non-nil");
	NSAssert( [sprite isKindOfClass:[CCSprite class]], @"CCSpriteSheet only supports CCSprites as children");
	
	
	while(index >= textureAtlas_.capacity || textureAtlas_.capacity == textureAtlas_.totalQuads )
		[self increaseAtlasCapacity];

	//
	// update the quad directly. Don't add the sprite to the scene graph
	//

	[sprite useBatchNode:self];
	[sprite setAtlasIndex:index];

	ccV3F_C4B_T2F_Quad quad = [sprite quad];
	[textureAtlas_ insertQuad:&quad atIndex:index];
	
	// XXX: updateTransform will update the textureAtlas too using updateQuad.
	// XXX: so, it should be AFTER the insertQuad
	[sprite setDirty:YES];
	[sprite updateTransform];
}

/* This is the opposite of "addQuadFromSprite.
 It add the sprite to the children and descendants array, but it doesn't update add it to the texture atlas
 */
-(id) addSpriteWithoutQuad:(CCSprite*)child z:(unsigned int)z tag:(int)aTag
{
	NSAssert( child != nil, @"Argument must be non-nil");
	NSAssert( [child isKindOfClass:[CCSprite class]], @"CCSpriteSheet only supports CCSprites as children");
	
	// quad index is Z
	[child setAtlasIndex:z];
	
	// XXX: optimize with a binary search
	int i=0;
	for( CCSprite *c in descendants_ ) {
		if( c.atlasIndex >= z )
			break;
		i++;
	}
	[descendants_ insertObject:child atIndex:i];
	
	
	// IMPORTANT: Call super, and not self. Avoid adding it to the texture atlas array
	[super addChild:child z:z tag:aTag];
	return self;	
}
@end


#pragma mark -
#pragma mark CCTMXLayer

@interface CCTMXLayer (Private)
-(CGPoint) positionForIsoAt:(CGPoint)pos;
-(CGPoint) positionForOrthoAt:(CGPoint)pos;
-(CGPoint) positionForHexAt:(CGPoint)pos;

-(CGPoint) calculateLayerOffset:(CGPoint)offset;

/* optimization methos */
-(CCSprite*) appendTileForGID:(unsigned int)gid at:(CGPoint)pos;
-(CCSprite*) insertTileForGID:(unsigned int)gid at:(CGPoint)pos;
-(CCSprite*) updateTileForGID:(unsigned int)gid at:(CGPoint)pos;

/* The layer recognizes some special properties, like cc_vertez */
-(void) parseInternalProperties;

-(int) vertexZForPos:(CGPoint)pos;

// adding quad from sprite
-(void)addQuadFromSprite:(CCSprite*)sprite quadIndex:(unsigned int)index;

// adds an sprite without the quad
-(id)addSpriteWithoutQuad:(CCSprite*)child z:(int)z tag:(int)aTag;

// index
-(NSUInteger) atlasIndexForExistantZ:(NSUInteger)z;
-(NSUInteger) atlasIndexForNewZ:(NSUInteger)z;
@end

@implementation CCTMXLayer
@synthesize layerSize = layerSize_, layerName = layerName_, tiles = tiles_;
@synthesize tileset = tileset_;
@synthesize layerOrientation = layerOrientation_;
@synthesize mapTileSize = mapTileSize_;
@synthesize properties = properties_;

#pragma mark CCTMXLayer - init & alloc & dealloc

+(id) layerWithTilesetInfo:(CCTMXTilesetInfo*)tilesetInfo layerInfo:(CCTMXLayerInfo*)layerInfo mapInfo:(CCTMXMapInfo*)mapInfo
{
	return [[[self alloc] initWithTilesetInfo:tilesetInfo layerInfo:layerInfo mapInfo:mapInfo] autorelease];
}

-(id) initWithTilesetInfo:(CCTMXTilesetInfo*)tilesetInfo layerInfo:(CCTMXLayerInfo*)layerInfo mapInfo:(CCTMXMapInfo*)mapInfo
{	
	// XXX: is 35% a good estimate ?
	CGSize size = layerInfo.layerSize;
	float totalNumberOfTiles = size.width * size.height;
	float capacity = totalNumberOfTiles * 0.35f + 1; // 35 percent is occupied ?
	
	CCTexture2D *tex = nil;
	if( tilesetInfo )
		tex = [[CCTextureCache sharedTextureCache] addImage:tilesetInfo.sourceImage];
	
	if((self = [super initWithTexture:tex capacity:capacity])) {		

		// layerInfo
		self.layerName = layerInfo.name;
		layerSize_ = layerInfo.layerSize;
		tiles_ = layerInfo.tiles;
		minGID_ = layerInfo.minGID;
		maxGID_ = layerInfo.maxGID;
		opacity_ = layerInfo.opacity;
		self.properties = [NSMutableDictionary dictionaryWithDictionary:layerInfo.properties];

		// tilesetInfo
		self.tileset = tilesetInfo;
		
		// mapInfo
		mapTileSize_ = mapInfo.tileSize;
		layerOrientation_ = mapInfo.orientation;
		
		// offset (after layer orientation is set);
		CGPoint offset = [self calculateLayerOffset:layerInfo.offset];
		[self setPositionInPixels:offset];
		
		atlasIndexArray_ = ccCArrayNew(totalNumberOfTiles);
		
		[self setContentSizeInPixels: CGSizeMake( layerSize_.width * mapTileSize_.width, layerSize_.height * mapTileSize_.height )];
		
		useAutomaticVertexZ_= NO;
		vertexZvalue_ = 0;
		alphaFuncValue_ = 0;

	}
	return self;
}

- (void) dealloc
{
	[layerName_ release];
	[tileset_ release];
	[reusedTile_ release];
	[properties_ release];
	
	if( atlasIndexArray_ ) {
		ccCArrayFree(atlasIndexArray_);
		atlasIndexArray_ = NULL;
	}
	
	if( tiles_ ) {
		free(tiles_);
		tiles_ = NULL;
	}
	
	[super dealloc];
}

-(void) releaseMap
{
	if( tiles_) {
		free( tiles_);
		tiles_ = NULL;
	}
	
	if( atlasIndexArray_ ) {
		ccCArrayFree(atlasIndexArray_);
		atlasIndexArray_ = NULL;
	}
}

#pragma mark CCTMXLayer - setup Tiles

-(void) setupTiles
{	
	// Optimization: quick hack that sets the image size on the tileset
	tileset_.imageSize = [textureAtlas_.texture contentSizeInPixels];
	
	// By default all the tiles are aliased
	// pros:
	//  - easier to render
	// cons:
	//  - difficult to scale / rotate / etc.
	[textureAtlas_.texture setAliasTexParameters];
	
	CFByteOrder o = CFByteOrderGetCurrent();
		
	// Parse cocos2d properties
	[self parseInternalProperties];
	
	for( unsigned int y=0; y < layerSize_.height; y++ ) {
		for( unsigned int x=0; x < layerSize_.width; x++ ) {
			
			unsigned int pos = x + layerSize_.width * y;
			unsigned int gid = tiles_[ pos ];
			
			// gid are stored in little endian.
			// if host is big endian, then swap
			if( o == CFByteOrderBigEndian )
				gid = CFSwapInt32( gid );
			
			// XXX: gid == 0 --> empty tile
			if( gid != 0 ) {
				[self appendTileForGID:gid at:ccp(x,y)];
				
				// Optimization: update min and max GID rendered by the layer
				minGID_ = MIN(gid, minGID_);
				maxGID_ = MAX(gid, maxGID_);
			}
		}
	}
	
	NSAssert( maxGID_ >= tileset_.firstGid &&
			 minGID_ >= tileset_.firstGid, @"TMX: Only 1 tilset per layer is supported");	
}

#pragma mark CCTMXLayer - Properties

-(id) propertyNamed:(NSString *)propertyName 
{
	return [properties_ valueForKey:propertyName];
}

-(void) parseInternalProperties
{
	// if cc_vertex=automatic, then tiles will be rendered using vertexz

	NSString *vertexz = [self propertyNamed:@"cc_vertexz"];
	if( vertexz ) {
		if( [vertexz isEqualToString:@"automatic"] )
			useAutomaticVertexZ_ = YES;
		else
			vertexZvalue_ = [vertexz intValue];
	}
	
	NSString *alphaFuncVal = [self propertyNamed:@"cc_alpha_func"];
	alphaFuncValue_ = [alphaFuncVal floatValue];
}

#pragma mark CCTMXLayer - obtaining tiles/gids

-(CCSprite*) tileAt:(CGPoint)pos
{
	NSAssert( pos.x < layerSize_.width && pos.y < layerSize_.height && pos.x >=0 && pos.y >=0, @"TMXLayer: invalid position");
	NSAssert( tiles_ && atlasIndexArray_, @"TMXLayer: the tiles map has been released");
	
	CCSprite *tile = nil;
	unsigned int gid = [self tileGIDAt:pos];
	
	// if GID == 0, then no tile is present
	if( gid ) {
		int z = pos.x + pos.y * layerSize_.width;
		tile = (CCSprite*) [self getChildByTag:z];
		
		// tile not created yet. create it
		if( ! tile ) {
			CGRect rect = [tileset_ rectForGID:gid];			
			tile = [[CCSprite alloc] initWithBatchNode:self rectInPixels:rect];
			[tile setPositionInPixels: [self positionAt:pos]];
			[tile setVertexZ: [self vertexZForPos:pos]];
			tile.anchorPoint = CGPointZero;
			[tile setOpacity:opacity_];
			
			unsigned int indexForZ = [self atlasIndexForExistantZ:z];
			[self addSpriteWithoutQuad:tile z:indexForZ tag:z];
			[tile release];
		}
	}
	return tile;
}

-(unsigned int) tileGIDAt:(CGPoint)pos
{
	NSAssert( pos.x < layerSize_.width && pos.y < layerSize_.height && pos.x >=0 && pos.y >=0, @"TMXLayer: invalid position");
	NSAssert( tiles_ && atlasIndexArray_, @"TMXLayer: the tiles map has been released");
	
	int idx = pos.x + pos.y * layerSize_.width;
	return tiles_[ idx ];
}

#pragma mark CCTMXLayer - adding helper methods

-(CCSprite*) insertTileForGID:(unsigned int)gid at:(CGPoint)pos
{
	CGRect rect = [tileset_ rectForGID:gid];
	
	NSInteger z = pos.x + pos.y * layerSize_.width;
	
	if( ! reusedTile_ )
		reusedTile_ = [[CCSprite alloc] initWithBatchNode:self rectInPixels:rect];
	else
		[reusedTile_ initWithBatchNode:self rectInPixels:rect];
	
	[reusedTile_ setPositionInPixels: [self positionAt:pos]];
	[reusedTile_ setVertexZ: [self vertexZForPos:pos]];
	reusedTile_.anchorPoint = CGPointZero;
	[reusedTile_ setOpacity:opacity_];
	
	// get atlas index
	NSUInteger indexForZ = [self atlasIndexForNewZ:z];
	
	// Optimization: add the quad without adding a child
	[self addQuadFromSprite:reusedTile_ quadIndex:indexForZ];
	
	// insert it into the local atlasindex array
	ccCArrayInsertValueAtIndex(atlasIndexArray_, (void*)z, indexForZ);
	
	// update possible children
	CCSprite *sprite;
	CCARRAY_FOREACH(children_, sprite) {
		unsigned int ai = [sprite atlasIndex];
		if( ai >= indexForZ)
			[sprite setAtlasIndex: ai+1];
	}
	
	tiles_[z] = gid;
	
	return reusedTile_;
}

-(CCSprite*) updateTileForGID:(unsigned int)gid at:(CGPoint)pos
{
	CGRect rect = [tileset_ rectForGID:gid];
	
	int z = pos.x + pos.y * layerSize_.width;
	
	if( ! reusedTile_ )
		reusedTile_ = [[CCSprite alloc] initWithBatchNode:self rectInPixels:rect];
	else
		[reusedTile_ initWithBatchNode:self rectInPixels:rect];
	
	[reusedTile_ setPositionInPixels: [self positionAt:pos]];
	[reusedTile_ setVertexZ: [self vertexZForPos:pos]];
	reusedTile_.anchorPoint = CGPointZero;
	[reusedTile_ setOpacity:opacity_];
	
	// get atlas index
	unsigned int indexForZ = [self atlasIndexForExistantZ:z];

	[reusedTile_ setAtlasIndex:indexForZ];
	[reusedTile_ setDirty:YES];
	[reusedTile_ updateTransform];
	tiles_[z] = gid;
	
	return reusedTile_;
}


// used only when parsing the map. useless after the map was parsed
// since lot's of assumptions are no longer true
-(CCSprite*) appendTileForGID:(unsigned int)gid at:(CGPoint)pos
{
	CGRect rect = [tileset_ rectForGID:gid];
	
	NSInteger z = pos.x + pos.y * layerSize_.width;
	
	if( ! reusedTile_ )
		reusedTile_ = [[CCSprite alloc] initWithBatchNode:self rectInPixels:rect];
	else
		[reusedTile_ initWithBatchNode:self rectInPixels:rect];
	
	[reusedTile_ setPositionInPixels: [self positionAt:pos]];
	[reusedTile_ setVertexZ: [self vertexZForPos:pos]];
	reusedTile_.anchorPoint = CGPointZero;
	[reusedTile_ setOpacity:opacity_];
	
	// optimization:
	// The difference between appendTileForGID and insertTileforGID is that append is faster, since
	// it appends the tile at the end of the texture atlas
	NSUInteger indexForZ = atlasIndexArray_->num;


	// don't add it using the "standard" way.
	[self addQuadFromSprite:reusedTile_ quadIndex:indexForZ];
	
	
	// append should be after addQuadFromSprite since it modifies the quantity values
	ccCArrayInsertValueAtIndex(atlasIndexArray_, (void*)z, indexForZ);
	
	return reusedTile_;
}

#pragma mark CCTMXLayer - atlasIndex and Z

int compareInts (const void * a, const void * b)
{
	return ( *(int*)a - *(int*)b );
}

-(NSUInteger) atlasIndexForExistantZ:(NSUInteger)z
{
	NSInteger key = z;
	NSInteger *item = bsearch((void*)&key, (void*)&atlasIndexArray_->arr[0], atlasIndexArray_->num, sizeof(void*), compareInts);
	
	NSAssert( item, @"TMX atlas index not found. Shall not happen");

	NSUInteger index = ((NSInteger)item - (NSInteger)atlasIndexArray_->arr) / sizeof(void*);
	return index;
}

-(NSUInteger)atlasIndexForNewZ:(NSUInteger)z
{
	// XXX: This can be improved with a sort of binary search
	NSUInteger i = 0;
	for(i = 0; i< atlasIndexArray_->num; i++) {
		NSUInteger val = (NSUInteger) atlasIndexArray_->arr[i];
		if( z < val )
			break;
	}	
	return i;
}

#pragma mark CCTMXLayer - adding / remove tiles

-(void) setTileGID:(unsigned int)gid at:(CGPoint)pos
{
	NSAssert( pos.x < layerSize_.width && pos.y < layerSize_.height && pos.x >=0 && pos.y >=0, @"TMXLayer: invalid position");
	NSAssert( tiles_ && atlasIndexArray_, @"TMXLayer: the tiles map has been released");
	NSAssert( gid == 0 || gid >= tileset_.firstGid, @"TMXLayer: invalid gid" );

	unsigned int currentGID = [self tileGIDAt:pos];
	
	if( currentGID != gid ) {
		
		// setting gid=0 is equal to remove the tile
		if( gid == 0 )
			[self removeTileAt:pos];

		// empty tile. create a new one
		else if( currentGID == 0 )
			[self insertTileForGID:gid at:pos];

		// modifying an existing tile with a non-empty tile
		else {

			unsigned int z = pos.x + pos.y * layerSize_.width;
			id sprite = [self getChildByTag:z];
			if( sprite ) {
				CGRect rect = [tileset_ rectForGID:gid];
				[sprite setTextureRectInPixels:rect rotated:NO untrimmedSize:rect.size];
				tiles_[z] = gid;
			} else
				[self updateTileForGID:gid at:pos];
		}
	}
}

-(void) addChild: (CCNode*)node z:(int)z tag:(int)tag
{
	NSAssert(NO, @"addChild: is not supported on CCTMXLayer. Instead use setTileGID:at:/tileAt:");
}

-(void) removeChild:(CCSprite*)sprite cleanup:(BOOL)cleanup
{
	// allows removing nil objects
	if( ! sprite )
		return;

	NSAssert( [children_ containsObject:sprite], @"Tile does not belong to TMXLayer");
	
	unsigned int atlasIndex = [sprite atlasIndex];
	NSUInteger zz = (NSUInteger) atlasIndexArray_->arr[atlasIndex];
	tiles_[zz] = 0;
	ccCArrayRemoveValueAtIndex(atlasIndexArray_, atlasIndex);
	[super removeChild:sprite cleanup:cleanup];
}

-(void) removeTileAt:(CGPoint)pos
{
	NSAssert( pos.x < layerSize_.width && pos.y < layerSize_.height && pos.x >=0 && pos.y >=0, @"TMXLayer: invalid position");
	NSAssert( tiles_ && atlasIndexArray_, @"TMXLayer: the tiles map has been released");

	unsigned int gid = [self tileGIDAt:pos];
	
	if( gid ) {
		
		unsigned int z = pos.x + pos.y * layerSize_.width;
		unsigned atlasIndex = [self atlasIndexForExistantZ:z];
		
		// remove tile from GID map
		tiles_[z] = 0;

		// remove tile from atlas position array
		ccCArrayRemoveValueAtIndex(atlasIndexArray_, atlasIndex);
		
		// remove it from sprites and/or texture atlas
		id sprite = [self getChildByTag:z];
		if( sprite )
			[super removeChild:sprite cleanup:YES];
		else {
			[textureAtlas_ removeQuadAtIndex:atlasIndex];

			// update possible children
			CCSprite *sprite;
			CCARRAY_FOREACH(children_, sprite) {
				unsigned int ai = [sprite atlasIndex];
				if( ai >= atlasIndex) {
					[sprite setAtlasIndex: ai-1];
				}
			}
		}
	}
}

#pragma mark CCTMXLayer - obtaining positions, offset

-(CGPoint) calculateLayerOffset:(CGPoint)pos
{
	CGPoint ret = CGPointZero;
	switch( layerOrientation_ ) {
		case CCTMXOrientationOrtho:
			ret = ccp( pos.x * mapTileSize_.width, -pos.y *mapTileSize_.height);
			break;
		case CCTMXOrientationIso:
			ret = ccp( (mapTileSize_.width /2) * (pos.x - pos.y),
					  (mapTileSize_.height /2 ) * (-pos.x - pos.y) );
			break;
		case CCTMXOrientationHex:
			NSAssert(CGPointEqualToPoint(pos, CGPointZero), @"offset for hexagonal map not implemented yet");
			break;
	}
	return ret;	
}

-(CGPoint) positionAt:(CGPoint)pos
{
	CGPoint ret = CGPointZero;
	switch( layerOrientation_ ) {
		case CCTMXOrientationOrtho:
			ret = [self positionForOrthoAt:pos];
			break;
		case CCTMXOrientationIso:
			ret = [self positionForIsoAt:pos];
			break;
		case CCTMXOrientationHex:
			ret = [self positionForHexAt:pos];
			break;
	}
	return ret;
}

-(CGPoint) positionForOrthoAt:(CGPoint)pos
{
	CGPoint xy = {
		pos.x * mapTileSize_.width,
		(layerSize_.height - pos.y - 1) * mapTileSize_.height,
	};
	return xy;
}

-(CGPoint) positionForIsoAt:(CGPoint)pos
{
	CGPoint xy = {
		mapTileSize_.width /2 * ( layerSize_.width + pos.x - pos.y - 1),
		mapTileSize_.height /2 * (( layerSize_.height * 2 - pos.x - pos.y) - 2),
	};
	return xy;
}

-(CGPoint) positionForHexAt:(CGPoint)pos
{
	float diffY = 0;
	if( (int)pos.x % 2 == 1 )
		diffY = -mapTileSize_.height/2 ;
	
	CGPoint xy = {
		pos.x * mapTileSize_.width*3/4,
		(layerSize_.height - pos.y - 1) * mapTileSize_.height + diffY
	};
	return xy;
}

-(int) vertexZForPos:(CGPoint)pos
{
	int ret = 0;
	unsigned int maxVal = 0;
	if( useAutomaticVertexZ_ ) {
		switch( layerOrientation_ ) {
			case CCTMXOrientationIso:
				maxVal = layerSize_.width + layerSize_.height;
				ret = -(maxVal - (pos.x + pos.y));
				break;
			case CCTMXOrientationOrtho:
				ret = -(layerSize_.height-pos.y);
				break;
			case CCTMXOrientationHex:
				NSAssert(NO,@"TMX Hexa zOrder not supported");
				break;
			default:
				NSAssert(NO,@"TMX invalid value");
				break;
		}
	} else
		ret = vertexZvalue_;
	
	return ret;
}

#pragma mark CCTMXLayer - draw

-(void) draw
{
	if( useAutomaticVertexZ_ ) {
		glEnable(GL_ALPHA_TEST);
		glAlphaFunc(GL_GREATER, alphaFuncValue_);
	}
	
	[super draw];
	
	if( useAutomaticVertexZ_ )
		glDisable(GL_ALPHA_TEST);
}
@end

